package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    /**
     * 用户添加购物车
     * @param shoppingCartDTO
     * @return
     */
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;



    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();

        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);

            cart.setNumber(cart.getNumber() +1);

            shoppingCartMapper.updateNumberById(cart);
        }else {
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());


            }else {
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(userId).build();

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();

        shoppingCartMapper.clean(userId);

    }

    @Override
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        boolean flag = true;
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart shoppingCart1 = list.get(0);

        if (shoppingCart1.getDishId() != null && shoppingCart1.getNumber() > 1 ) {
            shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
            flag = false;
        }
        if (shoppingCart1.getSetmealId() != null && shoppingCart1.getNumber() > 1) {
            shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
            flag = false;
        }

        if (shoppingCart1.getNumber() == 1 && flag) {
            shoppingCartMapper.delete(shoppingCart1);
        }
    }
}
